woocommerce_shipping_method_add_rate │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_shipping_method_add_rate', 'wp_kama_woocommerce_shipping_method_add_rate_filter', 10, 3 );

/**
 * Function for `woocommerce_shipping_method_add_rate` filter-hook.
 * 
 * @param  $rate 
 * @param  $args 
 * @param  $that 
 *
 * @return 
 */
function wp_kama_woocommerce_shipping_method_add_rate_filter( $rate, $args, $that ){

	// filter...
	return $rate;
}

$rate

-

$args

-

$that

-

Where the hook is called

$this->rates[ $args['id'] ] = apply_filters( 'woocommerce_shipping_method_add_rate', $rate, $args, $this );

Where the hook is used in WooCommerce